Fedora is mulling dropping the 32-bit x86 again, after the F26, which means I need to buy a new router. It's not like I cannot afford one... But it's such as hassle to migrate. I'm thinking about installing one in the background and then re-numbering it, in order to minimize issues. Even then, I cannot test, for instance, that VLANs work right, until I actually phase the box into production. It's much easier to keep a compatible 32-bit box mirrored and ready on stand-by.
In a sense, the amazing ease of upgrades in modern Fedora lulled me into this. Before, I re-installed anyway, and so could roll 64-bit just as easily.
P.S. According to records at the hoster, my primary public VM was installed as Fedora 15 and continuously upgraded since then.